if (OS_LINUX OR OS_DARWIN OR OS_FREEBSD)
    option(ENABLE_ICU "Enable ICU" ${ENABLE_LIBRARIES})
else ()
    option(ENABLE_ICU "Enable ICU" 0)
endif ()

if (NOT ENABLE_ICU)
    message(STATUS "Not using ICU")
    return()
endif()

set(ICU_SOURCE_DIR "${ClickHouse_SOURCE_DIR}/contrib/icu/icu4c/source")
set(ICUDATA_SOURCE_DIR "${ClickHouse_SOURCE_DIR}/contrib/icudata/")

# These lists of sources were generated from build log of the original ICU build system (configure + make).

set(ICUUC_SOURCES
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"${ICU_SOURCE_DIR}/common/bmpset.cpp"
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"${ICU_SOURCE_DIR}/common/locbased.cpp"
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"${ICU_SOURCE_DIR}/common/ubidiln.cpp"
"${ICU_SOURCE_DIR}/common/ubiditransform.cpp"
"${ICU_SOURCE_DIR}/common/ubidiwrt.cpp"
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"${ICU_SOURCE_DIR}/common/ucasemap.cpp"
"${ICU_SOURCE_DIR}/common/ucasemap_titlecase_brkiter.cpp"
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"${ICU_SOURCE_DIR}/common/uchar.cpp"
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"${ICU_SOURCE_DIR}/common/ucharstriebuilder.cpp"
"${ICU_SOURCE_DIR}/common/ucharstrieiterator.cpp"
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"${ICU_SOURCE_DIR}/common/ucnv2022.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_bld.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_cb.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_cnv.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_ct.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_err.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_ext.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_io.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_lmb.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_set.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_u16.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_u32.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_u7.cpp"
"${ICU_SOURCE_DIR}/common/ucnv_u8.cpp"
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"${ICU_SOURCE_DIR}/common/ucnvhz.cpp"
"${ICU_SOURCE_DIR}/common/ucnvisci.cpp"
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"${ICU_SOURCE_DIR}/common/udatamem.cpp"
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"${ICU_SOURCE_DIR}/common/uhash_us.cpp"
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"${ICU_SOURCE_DIR}/common/uloc_keytype.cpp"
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"${ICU_SOURCE_DIR}/common/ulocbuilder.cpp"
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"${ICU_SOURCE_DIR}/common/umath.cpp"
"${ICU_SOURCE_DIR}/common/umutablecptrie.cpp"
"${ICU_SOURCE_DIR}/common/umutex.cpp"
"${ICU_SOURCE_DIR}/common/unames.cpp"
"${ICU_SOURCE_DIR}/common/unifiedcache.cpp"
"${ICU_SOURCE_DIR}/common/unifilt.cpp"
"${ICU_SOURCE_DIR}/common/unifunct.cpp"
"${ICU_SOURCE_DIR}/common/uniset.cpp"
"${ICU_SOURCE_DIR}/common/uniset_closure.cpp"
"${ICU_SOURCE_DIR}/common/uniset_props.cpp"
"${ICU_SOURCE_DIR}/common/unisetspan.cpp"
"${ICU_SOURCE_DIR}/common/unistr.cpp"
"${ICU_SOURCE_DIR}/common/unistr_case.cpp"
"${ICU_SOURCE_DIR}/common/unistr_case_locale.cpp"
"${ICU_SOURCE_DIR}/common/unistr_cnv.cpp"
"${ICU_SOURCE_DIR}/common/unistr_props.cpp"
"${ICU_SOURCE_DIR}/common/unistr_titlecase_brkiter.cpp"
"${ICU_SOURCE_DIR}/common/unorm.cpp"
"${ICU_SOURCE_DIR}/common/unormcmp.cpp"
"${ICU_SOURCE_DIR}/common/uobject.cpp"
"${ICU_SOURCE_DIR}/common/uprops.cpp"
"${ICU_SOURCE_DIR}/common/ures_cnv.cpp"
"${ICU_SOURCE_DIR}/common/uresbund.cpp"
"${ICU_SOURCE_DIR}/common/uresdata.cpp"
"${ICU_SOURCE_DIR}/common/usc_impl.cpp"
"${ICU_SOURCE_DIR}/common/uscript.cpp"
"${ICU_SOURCE_DIR}/common/uscript_props.cpp"
"${ICU_SOURCE_DIR}/common/uset.cpp"
"${ICU_SOURCE_DIR}/common/uset_props.cpp"
"${ICU_SOURCE_DIR}/common/usetiter.cpp"
"${ICU_SOURCE_DIR}/common/ushape.cpp"
"${ICU_SOURCE_DIR}/common/usprep.cpp"
"${ICU_SOURCE_DIR}/common/ustack.cpp"
"${ICU_SOURCE_DIR}/common/ustr_cnv.cpp"
"${ICU_SOURCE_DIR}/common/ustr_titlecase_brkiter.cpp"
"${ICU_SOURCE_DIR}/common/ustr_wcs.cpp"
"${ICU_SOURCE_DIR}/common/ustrcase.cpp"
"${ICU_SOURCE_DIR}/common/ustrcase_locale.cpp"
"${ICU_SOURCE_DIR}/common/ustrenum.cpp"
"${ICU_SOURCE_DIR}/common/ustrfmt.cpp"
"${ICU_SOURCE_DIR}/common/ustring.cpp"
"${ICU_SOURCE_DIR}/common/ustrtrns.cpp"
"${ICU_SOURCE_DIR}/common/utext.cpp"
"${ICU_SOURCE_DIR}/common/utf_impl.cpp"
"${ICU_SOURCE_DIR}/common/util.cpp"
"${ICU_SOURCE_DIR}/common/util_props.cpp"
"${ICU_SOURCE_DIR}/common/utrace.cpp"
"${ICU_SOURCE_DIR}/common/utrie.cpp"
"${ICU_SOURCE_DIR}/common/utrie2.cpp"
"${ICU_SOURCE_DIR}/common/utrie2_builder.cpp"
"${ICU_SOURCE_DIR}/common/utrie_swap.cpp"
"${ICU_SOURCE_DIR}/common/uts46.cpp"
"${ICU_SOURCE_DIR}/common/utypes.cpp"
"${ICU_SOURCE_DIR}/common/uvector.cpp"
"${ICU_SOURCE_DIR}/common/uvectr32.cpp"
"${ICU_SOURCE_DIR}/common/uvectr64.cpp"
"${ICU_SOURCE_DIR}/common/wintz.cpp")

set(ICUI18N_SOURCES
"${ICU_SOURCE_DIR}/i18n/alphaindex.cpp"
"${ICU_SOURCE_DIR}/i18n/anytrans.cpp"
"${ICU_SOURCE_DIR}/i18n/astro.cpp"
"${ICU_SOURCE_DIR}/i18n/basictz.cpp"
"${ICU_SOURCE_DIR}/i18n/bocsu.cpp"
"${ICU_SOURCE_DIR}/i18n/brktrans.cpp"
"${ICU_SOURCE_DIR}/i18n/buddhcal.cpp"
"${ICU_SOURCE_DIR}/i18n/calendar.cpp"
"${ICU_SOURCE_DIR}/i18n/casetrn.cpp"
"${ICU_SOURCE_DIR}/i18n/cecal.cpp"
"${ICU_SOURCE_DIR}/i18n/chnsecal.cpp"
"${ICU_SOURCE_DIR}/i18n/choicfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/coleitr.cpp"
"${ICU_SOURCE_DIR}/i18n/coll.cpp"
"${ICU_SOURCE_DIR}/i18n/collation.cpp"
"${ICU_SOURCE_DIR}/i18n/collationbuilder.cpp"
"${ICU_SOURCE_DIR}/i18n/collationcompare.cpp"
"${ICU_SOURCE_DIR}/i18n/collationdata.cpp"
"${ICU_SOURCE_DIR}/i18n/collationdatabuilder.cpp"
"${ICU_SOURCE_DIR}/i18n/collationdatareader.cpp"
"${ICU_SOURCE_DIR}/i18n/collationdatawriter.cpp"
"${ICU_SOURCE_DIR}/i18n/collationfastlatin.cpp"
"${ICU_SOURCE_DIR}/i18n/collationfastlatinbuilder.cpp"
"${ICU_SOURCE_DIR}/i18n/collationfcd.cpp"
"${ICU_SOURCE_DIR}/i18n/collationiterator.cpp"
"${ICU_SOURCE_DIR}/i18n/collationkeys.cpp"
"${ICU_SOURCE_DIR}/i18n/collationroot.cpp"
"${ICU_SOURCE_DIR}/i18n/collationrootelements.cpp"
"${ICU_SOURCE_DIR}/i18n/collationruleparser.cpp"
"${ICU_SOURCE_DIR}/i18n/collationsets.cpp"
"${ICU_SOURCE_DIR}/i18n/collationsettings.cpp"
"${ICU_SOURCE_DIR}/i18n/collationtailoring.cpp"
"${ICU_SOURCE_DIR}/i18n/collationweights.cpp"
"${ICU_SOURCE_DIR}/i18n/compactdecimalformat.cpp"
"${ICU_SOURCE_DIR}/i18n/coptccal.cpp"
"${ICU_SOURCE_DIR}/i18n/cpdtrans.cpp"
"${ICU_SOURCE_DIR}/i18n/csdetect.cpp"
"${ICU_SOURCE_DIR}/i18n/csmatch.cpp"
"${ICU_SOURCE_DIR}/i18n/csr2022.cpp"
"${ICU_SOURCE_DIR}/i18n/csrecog.cpp"
"${ICU_SOURCE_DIR}/i18n/csrmbcs.cpp"
"${ICU_SOURCE_DIR}/i18n/csrsbcs.cpp"
"${ICU_SOURCE_DIR}/i18n/csrucode.cpp"
"${ICU_SOURCE_DIR}/i18n/csrutf8.cpp"
"${ICU_SOURCE_DIR}/i18n/curramt.cpp"
"${ICU_SOURCE_DIR}/i18n/currfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/currpinf.cpp"
"${ICU_SOURCE_DIR}/i18n/currunit.cpp"
"${ICU_SOURCE_DIR}/i18n/dangical.cpp"
"${ICU_SOURCE_DIR}/i18n/datefmt.cpp"
"${ICU_SOURCE_DIR}/i18n/dayperiodrules.cpp"
"${ICU_SOURCE_DIR}/i18n/dcfmtsym.cpp"
"${ICU_SOURCE_DIR}/i18n/decContext.cpp"
"${ICU_SOURCE_DIR}/i18n/decNumber.cpp"
"${ICU_SOURCE_DIR}/i18n/decimfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/displayoptions.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-bignum-dtoa.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-bignum.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-cached-powers.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-double-to-string.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-fast-dtoa.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-string-to-double.cpp"
"${ICU_SOURCE_DIR}/i18n/double-conversion-strtod.cpp"
"${ICU_SOURCE_DIR}/i18n/dtfmtsym.cpp"
"${ICU_SOURCE_DIR}/i18n/dtitvfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/dtitvinf.cpp"
"${ICU_SOURCE_DIR}/i18n/dtptngen.cpp"
"${ICU_SOURCE_DIR}/i18n/dtrule.cpp"
"${ICU_SOURCE_DIR}/i18n/erarules.cpp"
"${ICU_SOURCE_DIR}/i18n/esctrn.cpp"
"${ICU_SOURCE_DIR}/i18n/ethpccal.cpp"
"${ICU_SOURCE_DIR}/i18n/fmtable.cpp"
"${ICU_SOURCE_DIR}/i18n/fmtable_cnv.cpp"
"${ICU_SOURCE_DIR}/i18n/format.cpp"
"${ICU_SOURCE_DIR}/i18n/formatted_string_builder.cpp"
"${ICU_SOURCE_DIR}/i18n/formattedval_iterimpl.cpp"
"${ICU_SOURCE_DIR}/i18n/formattedval_sbimpl.cpp"
"${ICU_SOURCE_DIR}/i18n/formattedvalue.cpp"
"${ICU_SOURCE_DIR}/i18n/fphdlimp.cpp"
"${ICU_SOURCE_DIR}/i18n/fpositer.cpp"
"${ICU_SOURCE_DIR}/i18n/funcrepl.cpp"
"${ICU_SOURCE_DIR}/i18n/gender.cpp"
"${ICU_SOURCE_DIR}/i18n/gregocal.cpp"
"${ICU_SOURCE_DIR}/i18n/gregoimp.cpp"
"${ICU_SOURCE_DIR}/i18n/hebrwcal.cpp"
"${ICU_SOURCE_DIR}/i18n/indiancal.cpp"
"${ICU_SOURCE_DIR}/i18n/inputext.cpp"
"${ICU_SOURCE_DIR}/i18n/islamcal.cpp"
"${ICU_SOURCE_DIR}/i18n/iso8601cal.cpp"
"${ICU_SOURCE_DIR}/i18n/japancal.cpp"
"${ICU_SOURCE_DIR}/i18n/listformatter.cpp"
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"${ICU_SOURCE_DIR}/i18n/measure.cpp"
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"${ICU_SOURCE_DIR}/i18n/name2uni.cpp"
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"${ICU_SOURCE_DIR}/i18n/nfrule.cpp"
"${ICU_SOURCE_DIR}/i18n/nfsubs.cpp"
"${ICU_SOURCE_DIR}/i18n/nortrans.cpp"
"${ICU_SOURCE_DIR}/i18n/nultrans.cpp"
"${ICU_SOURCE_DIR}/i18n/number_affixutils.cpp"
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"${ICU_SOURCE_DIR}/i18n/number_formatimpl.cpp"
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"${ICU_SOURCE_DIR}/i18n/number_integerwidth.cpp"
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"${ICU_SOURCE_DIR}/i18n/number_output.cpp"
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"${ICU_SOURCE_DIR}/i18n/number_simple.cpp"
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"${ICU_SOURCE_DIR}/i18n/number_symbolswrapper.cpp"
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"${ICU_SOURCE_DIR}/i18n/numfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_affixes.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_compositions.cpp"
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"${ICU_SOURCE_DIR}/i18n/remtrans.cpp"
"${ICU_SOURCE_DIR}/i18n/repattrn.cpp"
"${ICU_SOURCE_DIR}/i18n/rulebasedcollator.cpp"
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"${ICU_SOURCE_DIR}/i18n/search.cpp"
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"${ICU_SOURCE_DIR}/i18n/sharedbreakiterator.cpp"
"${ICU_SOURCE_DIR}/i18n/simpletz.cpp"
"${ICU_SOURCE_DIR}/i18n/smpdtfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/smpdtfst.cpp"
"${ICU_SOURCE_DIR}/i18n/sortkey.cpp"
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"${ICU_SOURCE_DIR}/i18n/string_segment.cpp"
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"${ICU_SOURCE_DIR}/i18n/taiwncal.cpp"
"${ICU_SOURCE_DIR}/i18n/timezone.cpp"
"${ICU_SOURCE_DIR}/i18n/titletrn.cpp"
"${ICU_SOURCE_DIR}/i18n/tmunit.cpp"
"${ICU_SOURCE_DIR}/i18n/tmutamt.cpp"
"${ICU_SOURCE_DIR}/i18n/tmutfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/tolowtrn.cpp"
"${ICU_SOURCE_DIR}/i18n/toupptrn.cpp"
"${ICU_SOURCE_DIR}/i18n/translit.cpp"
"${ICU_SOURCE_DIR}/i18n/transreg.cpp"
"${ICU_SOURCE_DIR}/i18n/tridpars.cpp"
"${ICU_SOURCE_DIR}/i18n/tzfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/tzgnames.cpp"
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"${ICU_SOURCE_DIR}/i18n/tznames_impl.cpp"
"${ICU_SOURCE_DIR}/i18n/tzrule.cpp"
"${ICU_SOURCE_DIR}/i18n/tztrans.cpp"
"${ICU_SOURCE_DIR}/i18n/ucal.cpp"
"${ICU_SOURCE_DIR}/i18n/ucln_in.cpp"
"${ICU_SOURCE_DIR}/i18n/ucol.cpp"
"${ICU_SOURCE_DIR}/i18n/ucol_res.cpp"
"${ICU_SOURCE_DIR}/i18n/ucol_sit.cpp"
"${ICU_SOURCE_DIR}/i18n/ucoleitr.cpp"
"${ICU_SOURCE_DIR}/i18n/ucsdet.cpp"
"${ICU_SOURCE_DIR}/i18n/udat.cpp"
"${ICU_SOURCE_DIR}/i18n/udateintervalformat.cpp"
"${ICU_SOURCE_DIR}/i18n/udatpg.cpp"
"${ICU_SOURCE_DIR}/i18n/ufieldpositer.cpp"
"${ICU_SOURCE_DIR}/i18n/uitercollationiterator.cpp"
"${ICU_SOURCE_DIR}/i18n/ulistformatter.cpp"
"${ICU_SOURCE_DIR}/i18n/ulocdata.cpp"
"${ICU_SOURCE_DIR}/i18n/umsg.cpp"
"${ICU_SOURCE_DIR}/i18n/unesctrn.cpp"
"${ICU_SOURCE_DIR}/i18n/uni2name.cpp"
"${ICU_SOURCE_DIR}/i18n/units_complexconverter.cpp"
"${ICU_SOURCE_DIR}/i18n/units_converter.cpp"
"${ICU_SOURCE_DIR}/i18n/units_data.cpp"
"${ICU_SOURCE_DIR}/i18n/units_router.cpp"
"${ICU_SOURCE_DIR}/i18n/unum.cpp"
"${ICU_SOURCE_DIR}/i18n/unumsys.cpp"
"${ICU_SOURCE_DIR}/i18n/upluralrules.cpp"
"${ICU_SOURCE_DIR}/i18n/uregex.cpp"
"${ICU_SOURCE_DIR}/i18n/uregexc.cpp"
"${ICU_SOURCE_DIR}/i18n/uregion.cpp"
"${ICU_SOURCE_DIR}/i18n/usearch.cpp"
"${ICU_SOURCE_DIR}/i18n/uspoof.cpp"
"${ICU_SOURCE_DIR}/i18n/uspoof_build.cpp"
"${ICU_SOURCE_DIR}/i18n/uspoof_conf.cpp"
"${ICU_SOURCE_DIR}/i18n/uspoof_impl.cpp"
"${ICU_SOURCE_DIR}/i18n/utf16collationiterator.cpp"
"${ICU_SOURCE_DIR}/i18n/utf8collationiterator.cpp"
"${ICU_SOURCE_DIR}/i18n/utmscale.cpp"
"${ICU_SOURCE_DIR}/i18n/utrans.cpp"
"${ICU_SOURCE_DIR}/i18n/vtzone.cpp"
"${ICU_SOURCE_DIR}/i18n/vzone.cpp"
"${ICU_SOURCE_DIR}/i18n/windtfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/winnmfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/wintzimpl.cpp"
"${ICU_SOURCE_DIR}/i18n/zonemeta.cpp"
"${ICU_SOURCE_DIR}/i18n/zrule.cpp"
"${ICU_SOURCE_DIR}/i18n/ztrans.cpp")

file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/empty.cpp" CONTENT " ")
enable_language(ASM)

if (OS_DARWIN)
    # Fine for both x86 and ARM
    set(ICUDATA_SOURCE_FILE "${ICUDATA_SOURCE_DIR}/darwin/icudt78l_dat.S")
elseif (ARCH_S390X)
    set(ICUDATA_SOURCE_FILE "${ICUDATA_SOURCE_DIR}/icudt78b_dat.S")
else ()
    set(ICUDATA_SOURCE_FILE "${ICUDATA_SOURCE_DIR}/icudt78l_dat.S")
endif ()
# ^^ you might be confused how for different little endian platforms (x86, ARM) the same assembly files can be used.
# These files are indeed assembly but they only contain data ('.long' directive), which makes them portable accross CPUs.
# Only the endianness and the character set (ASCII, EBCDIC) makes a difference, also see
# https://unicode-org.github.io/icu/userguide/icu_data/#sharing-icu-data-between-platforms, 'Sharing ICU Data Between Platforms')
# (and as an experiment, try re-generating the data files on x86 vs. ARM, ... you'll get exactly the same files)

set(ICUDATA_SOURCES
    "${ICUDATA_SOURCE_FILE}"
    "${CMAKE_CURRENT_BINARY_DIR}/empty.cpp" # Without this cmake can incorrectly detects library type (OBJECT) instead of SHARED/STATIC
)

# Note that we don't like any kind of binary plugins (because of runtime dependencies, vulnerabilities, ABI incompatibilities).
add_definitions(-D_REENTRANT -DU_HAVE_ELF_H=1 -DU_HAVE_STRTOD_L=1 -DU_HAVE_XLOCALE_H=0 -DDEFAULT_ICU_PLUGINS="/dev/null")

add_library(_icuuc ${ICUUC_SOURCES})
add_library(_icui18n ${ICUI18N_SOURCES})
add_library(_icudata ${ICUDATA_SOURCES})

target_link_libraries(_icuuc PRIVATE _icudata)
target_link_libraries(_icui18n PRIVATE _icuuc)

target_include_directories(_icuuc SYSTEM PUBLIC "${ICU_SOURCE_DIR}/common/")
target_include_directories(_icui18n SYSTEM PUBLIC "${ICU_SOURCE_DIR}/i18n/")

target_compile_definitions(_icuuc PRIVATE -DU_COMMON_IMPLEMENTATION)
target_compile_definitions(_icui18n PRIVATE -DU_I18N_IMPLEMENTATION)

add_library(_icu INTERFACE)
target_link_libraries(_icu INTERFACE _icui18n _icuuc _icudata)
add_library(ch_contrib::icu ALIAS _icu)
